Gas detector

A gas detector for remote detection of a gas in a target region, comprising a light source for emitting a wavelength-modulated light beam into said target region, said wavelength-modulated light beam carrying a wavelength modulation around an absorption wavelength of said gas, a light sensor for sensing light returning from said target region, a controller operatively connected to said light sensor for detecting a presence of said gas on a path of said wavelength-modulated light beam in said target region based on the returning light sensed by said light sensor, an indicator operatively connected to said controller for indicating said presence of said gas;wherein said gas detector comprises a scanning device, configured and arranged with respect to said light source for scanning said wavelength-modulated light beam, emitted by said light source, through said target region, and with respect to said light sensor in such a way that said light sensor receives said light returning from said target region via said scanning device, wherein said indicator is configured to cooperate with said scanning mirror to indicate a position of said gas in said target region, said indicator comprising a second light source for emitting a second light beam and a display, wherein said scanning device comprises a first scanning mirror for scanning said wavelength-modulated light beam through said target region and for reflecting said light returning from said target to said light sensor and a second scanning mirror for scanning said second light beam across said display in synchronism, said first and second scanning mirrors being configured for operating in synchronism, said controller being operatively connected to said second light source to modulate an intensity of said second light beam depending on whether presence of said gas on a path of said wavelength-modulated light beam is detected or not.